Improvement in sectional steam-generators



M. T. DAVIDSON.

Sectional Steam Generators.

Patented May 13, 1873.

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UNITED STATES:

PATENT OFFICE..

MARSHALL T. DAVIDSON, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN SECTIONAL STEAM-GENERATORS.

Specification forming part of Letters Patent No. 138,S66, dated May 13, 1873; application filed October 22, 1872.

To all whom it may concem:

Be it known that I, MARSHALL T. DAVID- SON, of the city of Brooklyn, county of Kings and State of New York, have invented a new and Improved Steam-Generator; and that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon making a part of this specification.

This invention is in the nature of an improvement in steam-generators; and the invention consists in a steam-generator formed of wrought-iron water-tubes, the rear ends of which are coupled together by return-bends, and the front ends secured to and opening into cast-iron corrugated steam-chambers, and so arranged that the flames and products of combustion will not only pass through the spaces between the several tubes, but will also pass entirely around the whole generator, in the manner hereinafter particularly described.

My boiler is of that kind known as a tubular sectional boiler-that is, a boiler composed of a series of tubes, within which the water is boiled and the stearn generated.

In the accompanying drawing, Figure 1 represents a side View of my boiler and setting, and Fig. 2 a front-end View of same.

Similar letters of reference indicate like parts in the several figures.

A represents the tubes composing' the boiler. The rear ends of said tubes are coupled together by cast-iron return-ben ds B, and the tubes are so arranged that as they are placed one above another one pair of tubes will be directly over the space between the lower or under pair of tubes; in other words, the tubes will be what is technically known as staggered so that theflames, &c., can freely circulate between and around said tubes, thereby exposing every part of their surface to the action of the heat. The front end of the tubes so arranged are screwed into cast-iron steamchambers E, each Vertical rowof double tubes having a separate uptake. These steam-chambers are castin an irregular form or with corrugations (see Fig. 2) to receive the ends of B by having right-hand screw-threads cut on one end of said tubes, and left-hand screwthreads cut on the other so that, as will be readily seen, to remove one of said tubes it is simply necessary to grasp it with ordinary 'pipe-tongs and unscrew it from the steamchamber and the return bend by the same motion, in the same way replacing the tube removed by a new one. By this means it is obvious that a tube can be removed and a new one replaced with but little trouble and loss of time.

My boiler, being constructed substantially as above described, is set within a brick chamber, K, in such manner that the heat, &c., from the fire will pass through and around the tubes, return-bends, and steam-chambers, as shown by the arrows in Fig. 1.

As will be readilyseen, the connections of my tubes, being independent of any rigidlyfixed or unyielding masses of metal, bolts, or tie-rods, have ample opportunity of expanding and contracting without the possibility of strain or causing rupture or leak. V

The steam-drum and the feed- Water drum are placed in the flue, as shown in Fig. 1, so that a uniform temperature of steam and water is maintained, and nearly all loss from condensation saved.

Having thus described my inventiou, what I claim as new, and desire to secure by Letters Patent, is-

1. A water-tube boiler having the rear ends of the tubes coupled together in independent pairs by cast-iron return-bends B, and the front ends of said tubes inserted into a corrugated steam chamber, substantially as de-' scribed.

2. The arrangement of the several pairs of tubes having the return bends' and. steamand-left-hand screw-threads forned on the chambers with relation to each other and to ends thereof, for the purpose described. the fire-space, substantially as and for the purpose set forth.

3. The combination of independent corruwitnesses:

gated steam or water chamber and cast-iron H. L. WATTENBERG, return-bende with water tubes having right- Gr. M. PLYMPTON.

MARSHALL T. DAVIDSON. 

